Aastra 400 MBU and 420d - poor battery?

I have 2 open Aastra 420d phones now, and just in standby mode, they don't keep a charge past 24 hours.
The vendor advertises 200 hours in standby, and 12 hours talk time.
Does anyone else have this issue?

I use a MBU400 at home and I dont think I can get 200 hours out of standby but it will go about a week so thats good enough for me. The handset for the 480i CT on the other hand will only last me about 2 days on standby.

http://www.vitelity.comhttp://3cxbook.com

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